1290708864 has 128 divisors (see below), whose sum is σ = 3902724000. Its totient is φ = 419696640.

The previous prime is 1290708863. The next prime is 1290708889. The reversal of 1290708864 is 4688070921.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290708863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137142 + ... + 146250.

Almost surely, 2^1290708864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1290708864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1951362000).

1290708864 is an abundant number, since it is smaller than the sum of its proper divisors (2612015136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1290708864 is an equidigital number, since it uses as much as digits as its factorization.

1290708864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9173 (or 9155 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 1290708864 is about 35926.4368397424. The cubic root of 1290708864 is about 1088.7865923675.

The spelling of 1290708864 in words is "one billion, two hundred ninety million, seven hundred eight thousand, eight hundred sixty-four".